image. A fully processed unit of operational data that is ready to
be transmitted to a remote unit; when loaded into control storage
in the remote unit, the image determines the operations of the
unit.
immediate instruction.
An
instruction that contains within itself an
operand for the operation specified, rather than an address of the
operand.
index register. A register whose contents may be used to modify
an operand address during the execution of computer instructions.
indicator. (1) A device that may
be
set into a prescribed state,
usually according to the result
of
a previous process or on the
occurrence of a specified condition in the equipment, and that
usually gives a visual
or
other indication of the existence
of
the
prescribed state, and that may in some cases
be
used to determine
the selection among alternative processes; for example, an
overflow indicator.
(2)
An item
of
data that may be interrogated
to determine whether a particular condition has been satisfied in
the execution
of
a computer program; for example, a switch
indicator, an overflow indicator.
inhibited.
(1)
Pertaining to a state
of
a processing unit in which
certain types of interruptions are not allowed to occur.
(2)
Pertaining to the state in which a transmission control unit or an
audio response unit cannot accept incoming calls on a line.
initialize. To set counters, switches, addresses,
or
contents of
storage to
0 or other starting values at the beginning of, or at
prescribed points in, the operation of a computer routine.
input/output
(I/O).
(1)
Pertaining to a device
or
to a channel that
may be involved in an input process, and,
at
a different time, in an
output process. In the English language,
"input/output"
may be
used in place
of
such terms
as
"input/output, data"
"input/
output signal," and
"input/output
terminals," when such
usage is clear in a given context.
(2)
Pertaining to a device whose
parts can be performing an input process and an output process
at
the same time.
(3)
Pertaining to either input or output, or both.
instruction. In a programming language, a meaningful expression
that specifies one operation and identifies its operands, if any.
Glossary-17
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